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From: Raghavendra Rao Ananta <rananta@google.com>
To: Paolo Bonzini <pbonzini@redhat.com>,
	Marc Zyngier <maz@kernel.org>,  Andrew Jones <drjones@redhat.com>,
	James Morse <james.morse@arm.com>,
	 Alexandru Elisei <alexandru.elisei@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,  Peter Shier <pshier@google.com>,
	Ricardo Koller <ricarkol@google.com>,
	 Oliver Upton <oupton@google.com>,
	Reiji Watanabe <reijiw@google.com>,
	 Jing Zhang <jingzhangos@google.com>,
	Raghavendra Rao Anata <rananta@google.com>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu,  linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org
Subject: [PATCH v8 07/15] KVM: arm64: selftests: Add basic support to generate delays
Date: Thu,  7 Oct 2021 23:34:31 +0000	[thread overview]
Message-ID: <20211007233439.1826892-8-rananta@google.com> (raw)
In-Reply-To: <20211007233439.1826892-1-rananta@google.com>

Add udelay() support to generate a delay in the guest.

The routines are derived and simplified from kernel's
arch/arm64/lib/delay.c.

Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Reviewed-by: Oliver Upton <oupton@google.com>
---
 .../selftests/kvm/include/aarch64/delay.h     | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 tools/testing/selftests/kvm/include/aarch64/delay.h

diff --git a/tools/testing/selftests/kvm/include/aarch64/delay.h b/tools/testing/selftests/kvm/include/aarch64/delay.h
new file mode 100644
index 000000000000..329e4f5079ea
--- /dev/null
+++ b/tools/testing/selftests/kvm/include/aarch64/delay.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * ARM simple delay routines
+ */
+
+#ifndef SELFTEST_KVM_ARM_DELAY_H
+#define SELFTEST_KVM_ARM_DELAY_H
+
+#include "arch_timer.h"
+
+static inline void __delay(uint64_t cycles)
+{
+	enum arch_timer timer = VIRTUAL;
+	uint64_t start = timer_get_cntct(timer);
+
+	while ((timer_get_cntct(timer) - start) < cycles)
+		cpu_relax();
+}
+
+static inline void udelay(unsigned long usec)
+{
+	__delay(usec_to_cycles(usec));
+}
+
+#endif /* SELFTEST_KVM_ARM_DELAY_H */
-- 
2.33.0.882.g93a45727a2-goog


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  parent reply	other threads:[~2021-10-07 23:39 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-10-07 23:34 [PATCH v8 00/15] KVM: arm64: selftests: Introduce arch_timer selftest Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 01/15] KVM: arm64: selftests: Add MMIO readl/writel support Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 02/15] tools: arm64: Import sysreg.h Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 03/15] KVM: arm64: selftests: Use read/write definitions from sysreg.h Raghavendra Rao Ananta
2021-10-11  8:15   ` Marc Zyngier
2021-10-11 16:08     ` Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 04/15] KVM: arm64: selftests: Introduce ARM64_SYS_KVM_REG Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 05/15] KVM: arm64: selftests: Add support for cpu_relax Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 06/15] KVM: arm64: selftests: Add basic support for arch_timers Raghavendra Rao Ananta
2021-10-07 23:34 ` Raghavendra Rao Ananta [this message]
2021-10-07 23:34 ` [PATCH v8 08/15] KVM: arm64: selftests: Add support to disable and enable local IRQs Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 09/15] KVM: arm64: selftests: Maintain consistency for vcpuid type Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 10/15] KVM: arm64: selftests: Add guest support to get the vcpuid Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 11/15] KVM: arm64: selftests: Add light-weight spinlock support Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 12/15] KVM: arm64: selftests: Add basic GICv3 support Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 13/15] KVM: arm64: selftests: Add host support for vGIC Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 14/15] KVM: arm64: selftests: Add arch_timer test Raghavendra Rao Ananta
2021-10-07 23:34 ` [PATCH v8 15/15] KVM: arm64: selftests: arch_timer: Support vCPU migration Raghavendra Rao Ananta
2021-10-17 10:20 ` [PATCH v8 00/15] KVM: arm64: selftests: Introduce arch_timer selftest Marc Zyngier

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